Electronic key



FIG. 1 is a front perspective view of an electronic key, showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side plan view thereof;

FIG. 5 is a right side plan view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken line showing in the figures of the drawing is for illustrative purposes only and forms no part of the claimed design. 

I claim the ornamental design for an electronic key, as shown and described. 